Difference between CAN1 and CAN 2 ports, In Mini carrier board only CAN 2 port is available, can we use dual GPS CAN setup?

ArduCopter Copter 4.0
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Can we use CAN splitter to Connect dual CAN here 3 GPS in CAN 2 port of the mini carrier board?

Screenshot 2022-11-02 at 1.31.32 PM
Screenshot 2022-11-02 at 1.31.32 PM1656×632 86 KB

Note: Current firmware only support CAN 1 ,CAN 2 is not supported. Dual CAN will be enabled in a future firmware update.
As per the screenshot CAN 2 is not supported what that means?